树莓派GPIO接口命名规则 A different mode has already been set解决方案
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在编写python调用GPIO接口的时候，发现很多python设置的
GPIO.setmode（GPIO.BCM）
GPIO.setmode（GPIO.BOARD）
太麻烦了，之前没有把树莓派的命名规则当回事，当文件出bug时才发现
bug：A different mode has already been set
我复制粘贴的代码。前面写了
GPIO.setmode（GPIO.BCM）
后面的不同调用里又写了
GPIO.setmode（GPIO.BOARD）
所以才会出现错误，只要把命名规则统一起来就好了。都换成BCM或者BOARD，但是要记得把接口的数值换了，因为BCM跟BOARD是不一样的。输入gpio readall就可以找到它们的对应规则
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